Counterboring-tool.



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UNITED STATES Patented September 29, 1903.

PATENT ',QFEICE.

CARL H. sCHADE, or CEDAR RAPIDS, AND GEQRGE T. s'rRITE, oE TAMA, i

IowA.

couNTERBoRlNc-Toot..

sPEcIFIcATIoN-.forming part of Letters Patent No. 740,04*?, datedseptember 29, 190e. I Application iiled September 15, 1902. Serial No.123,442. (Nrmodel.)

To all whont it may concern: I Be it known that we, CARL H. SCHADE, re-

. siding at Cedar Rapids, in the county of Linn,

and GEORGE T. STRITE, residing at Tama, in the county of Tama, State ofIowa, citizens of the United States, have invented certain new anduseful Improvements in Counterboring- Tools, of which the following is aspecification.

The object of this invention is to produce a boring or counterboringtool for metals adapted for -quick and accurate adjustment to varyingsizes of holes.

The nature of the invention will fully appear from the description andclaims following, reference being had to the accompanying drawings, inwhich- 'A Figure l is a sectional view of a device ernbodying ourinvention. Fig. 2 is a plan View of the same as seen from the upperside.

Fig. 3 is a sectional view showing the application of the same, inslightly-modiedform,

`to a boring-bar.

The device as illustrated in Figs. 1 and 2 is designed more especiallyfor use with a drill-press for counterboring, as in cuttingwashers,boring flue-holes in boiler-heads, and the like. In Fig. 3 thesame principleis applied in the construction of a boring-bar for a latheor similar machine-tool.

Referring to the drawings, A denotes the spindleof a drill-press. Tothisis fitted a tapered shank B, forming a part ofV the b or'-,

ing-tool. The head C of this tool is eccentric to the shank, is madecylindrical to take'a tool-holding collar D, and has a iiange' E toprevent the tool-holder being forced upward by the pressure of thedrill-spindle. The toolholder is preferably fastened to the cylindricalhead of the tool by clamping instead of by a set-screw'and is thereforeprovided with wings F F to take a cap screw or bolt G, the wings beingseparated by a slot H. In a lateral extension Iv of the collar is a holeJ, parallel with the center of the shank, to take a cylindrical shankedtool K, which is secured by a set-screw L. Concentric with the shank isa socket M to take a drill-bit N (or a mere stud) to serve as a centerin boring the larger hole. In some cases it would bev desirable for YVisthe same.

Having thus described our invention, what j we claim as new, anddesireto secure by Letthe toolto bore its own center hole, when the drillwould be used. In other cases all the center holes might be boredelsewhere and ,very quick and nice adjustment and over a considerablerange of variation in the sizes of holes desired.. The shank of the toolK being cylindrical admits of proper adjustment for cutting andclearance, the tool for boiler-head work and the like being in thenature of a simple parting-tool, as shown.

It will be understood that the adjustment of. the tool, radiallyconsidered, is made by loosening the clamp-bolt G, turning the collar Dto the proper point,and retightening the bolt. The adjustment ofthe toolitself in the holder is effectedby loosening the setscrew, moving thetool endwise or axially, and tightening the set-screw.

The collar may be provided with a radial hole O to take a tool P,secured by a set-screw Q. Mounted on a boring-bar R, having an eccentricS formed thereon, the device is equally convenient for general boring ata lathe. Considering the part to which the tool-holder is attached as adriver, it will be seen thatthe principle in both constructions tersPatent, is-

l. A boring-tool having a cylindrical head or enlargement parallel withand eccentric to its axis, and a tool-holder adapted vto turnthereon,for adjustment, and means for fastening it at any desired point.

2. In a boring-tool, the combination of a tool-holder adapted to beclamped to a cylindrical head, and a driver' therefor 'having a shank,acentering-stud concentric therewith, and a cylindrical head to take thetool-holder eccentric to said shank.

3. A boring-tool, embracing a driver with a shank by which it is driven,a cylindrical head provided with a retaining-flange and with a socket totake a drill or stud, a stud therefor, a toolholder adjustably mountedIn testimony whereof we aix our signaon said head, a tool tted to saidholder, and tures in presence of witnesses. j means for fastening thetool in the holder and the holder to the driver. 5 4. In combinationwith an eccentric driver,

substantially as described, a tool-holder fitted Witnesses for Schade:

to the eccentric of the driver and having a JOS. H. PRASTKA, tool-socketformed in a lateral arm thereof, H. L. WICK. Y separated clamping-wings,and a clamp-screw Witnesses for Strite:

1o or bolt therefor, and a set-screw or the like WILLIAM FORSYTHE,

to hold the tool. l F. B. PENROSE.

